Cardiac Muscle

Cardiac Muscle

By Andrew Nelson

Objective

• ​COmpare the contraction mechanisms of cardiac muscle and skeletal muscle

• Branched, striated cells interconnected in 3D networks

• Each cell has MANY actin and myosin filaments​

Cardiac Cell Structure

• Less developed sarcoplasmic reticulum

• AKA less calcium

• Most calcium comes from extracellular fluid​

Cardiac Cell Structure

Multiple Choice

What is the external covering of muscles called?

• Perimysium

• Endomysium

• Epimysium

• Cardiac has a longer twitch

Cardiac Muscle Vs Skeletal Muscle

• The opposing ends are connected by intercalated discs

• These junctions allow impulses to pass freely from cell to cell​

• One stimulation moves through the whole network​

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Cardiac Muscle

Multiple Choice

Where does most the calcium for cardiac muscle contraction come from?

• Myosin

• Actin

• Sarcoplasmic Reticulum

• Extracellular Fluid